RDP blocked despite firewall Allow rule

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http://serverfault.com – I used to be able to RDP to my work PC (Windows 7 Enterprise) whether it was on or off the domain. Since the installation of Symantec Endpoint Protection (which turns on the firewall when the PC is off the domain), inbound RDP connections are being blocked when it's not on the domain. However, I checked and there is a universal Allow rule for RDP in Windows firewall. Obviously something is still blocking RDP but I'm clueless about how to troubleshoot this. Help? (HowTos)